There are 6, not 2:
There are 6 Celtic languages spoken all over the United Kingdom:
Mostly in The UK and Ireland.
Welsh and Gaelic.
Scotland and Wales.
Because - English is not the original language of the UK. The original language was Celtic - spoken right across the UK. However - successive invasions by foreign nationalities (many from Arabia and surrounding areas) brought new languages to our shores. The original Celtic-speakers were forced to retreat into Ireland, Wales & Scotland - where (being separate tribes) they developed their own versions of the Celtic language - which we now call Irish, Welsh & Scottish.
The most commonly spoken language in the UK is English.
English is the main language in the UK
The official language of the UK is English.
English
klingon
The language common to both countries is English.
.... English .....Welsh .....Gaelic .....Cornish
The most numerous are Welsh and Gaelic, members of separate branches of the Celtic languages.
The official language of the UK is English. However, Welsh and Scottish Gaelic are also spoken in those two places. There is also Scots, but that is more of a dialect than a language and the ancient language of Cornish but very few people can speak it.
People in the UK speak English. Portuguese is spoken in Portugal and in Brazil.
english, french